On Sat, Aug 2, 2008 at 11:22 PM, Fabian Deutsch <fabian.deutsch@gmx.de> wrote:

Hey,

>
> I'm using KVM with the wonderful help of libvir (virsh), on a
> to-be-production-ready server of mine.
>
>
> I would like to be able to choose on a way or another the ip of each
> of my VM. As far as I can understand, the only way to get an IP (from
> a vm point of view) if the dhcp it. But I have no garantee vm1 will
> always get x.x.x.1 Ip adress...

I suppose you are speaking about the NAt-Solution.

Yes. Sorry. My server has 1 public IP address. Host will host an Apache proxying http services hosted by VMs. VMs will have private IP addresses (192.168.0.x).

I can not have any other public IP addresses, so bridging is not a solution (AFAICU)

Nat seems good choice in my case, I think.

Have a look at some bridge-Solution:
http://libvirt.org/formatnetwork.html#examplesRoute

Ok.

You are proposing me to use :

      <network>
	<name>local</name>
	<bridge name="virbr1" />
	<forward mode="route" dev="eth1"/>
	<ip address="192.168.122.1" netmask="255.255.255.0">
	  <dhcp>
	    <range start="192.168.122.2" end="192.168.122.254" />
	  </dhcp>
	</ip>
      </network>

I understand this defines a network, where IP address of host in VM-World is 192.168.122.1, and DHCP distributes IP addresses to VMs. Nat is disabled ?

I just don't understand how I can specify that VM1 (with its mac address), should have .1 IP address. Natting will be automagic ?

I must admit I don't really know how to use routing system, I presume :(

Thanx for your help,

- fabian

Olivier.